chore: cleanup — remove dead code, indexer stack, stale docs and assets

[thisisouvik]

Remove everything that was tracked but not used, and tidy the repo root ahead of the Neon migration and UI redesign.

Removed

• 8 unreferenced components (RoleDashboardScreen, AvailablePools, FinanceChart, WalletSetupCard, SorobanProfileCard, AuthAccessButton, SectionTitle, ui/table) and the duplicate root-level ErrorFallback/GlobalErrorBoundary (dashboard/ copies are the live ones)
• 4 unreferenced lib modules (level5-feedback, pool-security-config and the two lib/config/*.config.ts duplicates)
• SubQuery indexer stack: subquery/, schema.graphql, project.yaml, docker-compose.subquery.yml, lib/indexer, its test, the horizon_sync SQL and TRUSTLEND_INDEXER_* env vars. Dashboards now read straight from the database instead of trying the indexer first.
• Dockerfile.dev / docker-compose.yml (Supabase-specific, unused on Vercel)
• assets/ screenshots (22 PNGs; all stale once the UI is redesigned)
• Obsolete docs: OPTIMIZATION_SUMMARY, POOL_OPTIMIZATION, QUICK_START_POOL_QUERIES, SOROBAN_INDEXER_MIGRATION
• Unused deps: ethers, @albedo-link/intent, @subql/types-stellar

Moved

• Technical docs from the repo root into docs/ (kebab-case), and the four contracts/*.md into docs/contracts/. Only README, CONTRIBUTING, CODE_OF_CONDUCT, SECURITY, CHANGELOG and LICENSE stay at the root. All references (README, scripts, env example, workflow, Rust doc comment) updated.

Fixed

• .gitignore ignored /docs while docs/api.md was tracked
• app/actions/admin-pools.ts had four duplicated lines from a bad merge, which broke tsc --noEmit on main
• admin pools page did not pass borrow_cap through to the client (tsc error)
• vitest was collecting the Playwright spec in e2e/

[vercel]

Deployment failed for project trustlend-stellar with the following error:

Hobby accounts are limited to daily cron jobs. This cron expression (* * * * *) would run more than once per day. Upgrade to the Pro plan to unlock all Cron Jobs features on Vercel.

Learn More: https://vercel.link/3Fpeeb1

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